Go to the authorities. That's fine. I'm just not sure how much proof of violation is needed before they will come in. I am a bit skeptical at th OPs assertion that this contractor holds a monopoly in the building and it is for exactly this reason. If the DOT is given sufficient cause and not just hearsay to investigate and what the OP says is true, the contractor and a good portion of the station staff will be gone in a morning. If the driver is wrong and the authorities find no such violation or reason to investigate, where does that leave the OP? Working for a contractor who's gunning for him? I find it odd that some people think all it takes is an anonymous call to OSHA or the DOT to get full scale investigations of multi-billion dollar companies. If it were that simple the agencies would be log jammed for years in this country. Maybe that's why Republicans love sequestration.